GNU bug report logs - #72778
31.0.50; Calc: g f doesn't display gnuplot window after closing

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 72778 <at> debbugs.gnu.org
Subject: bug#72778: 31.0.50; Calc: g f doesn't display gnuplot window after closing
Date: Sat, 24 Aug 2024 09:25:04 +0300

> Date: Sat, 24 Aug 2024 07:49:53 +0200
> From:  Michael Heerdegen via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> In Calc, whenever I have displayed a graph view using g f, and then have
> been closing the Gnuplot X window, the next g f or g p will always not
> display the Gnuplot view.  Hitting the keys again displays it, however.
> 
> When I don't close the Gnuplot window, the graph view is updated as
> expected.
> 
> 
> I found nothing obvious in the Calc code.  In the scenario where the
> window doesn't pop up, the Gnuplot process is alive.  I edebugged
> `calc-gnuplot-command' and the relevant line
> 
>   (process-send-string calc-gnuplot-process cmd)
> 
> seems to be the correct call.  When edebugging, simply executing this
> very same call makes the Gnuplot window appear!  For some reason,
> Gnuplot only displays the window for the second process-send-string
> call.  Could be a Gnuplot bug, I dunno.
> 
> And...when I redefine `calc-gnuplot-alive' to always fail, the problem
> is fixed, in a very inelegant way of course.  So there is something
> wrong when talking with Gnuplot, or with Gnuplot itself.
> 
> I'm on Debian, I tried several different graphical Gnuplot versions, but
> it's the same for all of them.
> 
> I'm thankful for all insights.

Buffering issue?  Is gnuplot run via a pipe or a PTY?

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